package com.sky.service.impl;

import com.alibaba.druid.util.StringUtils;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    /**
     * 统计指定时间区间内的营业额数据
     * @param startDate
     * @param endDate
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate startDate, LocalDate endDate) {
        List<LocalDate> dataList = new ArrayList<>();

        dataList.add(startDate);
        while( !startDate.equals(endDate) ) {
            startDate = startDate.plusDays(1);
            dataList.add(startDate);
        }

        List<Double> turnoverList = new ArrayList<>();
        for(LocalDate date : dataList) {
             LocalDateTime beginTime= LocalDateTime.of(date, LocalTime.MIN);
             LocalDateTime endTime= LocalDateTime.of(date, LocalTime.MAX);

             Map map = new HashMap();
             map.put("beginTime", beginTime);
             map.put("endTime", endTime);
             map.put("status", Orders.COMPLETED);
             Double turnover = orderMapper.sumByMap(map);
             if( turnover == null ) {
                 turnover = 0.0;
             }
             turnoverList.add(turnover);
        }


        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < dataList.size(); i++) {
            sb.append(dataList.get(i)); // 自动调用 LocalDate 的 toString()
            if (i < dataList.size() - 1) {
                sb.append(",");
            }
        }
        String result = sb.toString();

        StringBuilder sb1 = new StringBuilder();
        for (int i = 0; i < turnoverList.size(); i++) {
            sb1.append(turnoverList.get(i)); // 自动调用 LocalDate 的 toString()
            if (i < turnoverList.size() - 1) {
                sb1.append(",");
            }
        }
        String result1= sb1.toString();


        return TurnoverReportVO
                .builder()
                .dateList(result)
                .turnoverList(result1)
                .build();

    }

    //统计指定时间区间内的营业额数据
    @Autowired
    private UserMapper userMapper;

    //统计指定时间区间内的用户数据
    public UserReportVO getUserStatistics(LocalDate begin,LocalDate end){
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的新增用户数量 select count(id) from user where create_time < ? and create_time> ?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();
        for(LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end",endTime);//只加一个end（1个参数）自动匹配统计总计的SQL语句
            //总用户数量
            Integer totalUser = userMapper.countUserByMap(map);
            map.put("begin",beginTime);//再加一个参数匹配统计每日新增的SQL语句
            //新增用户数量
            Integer newUser = userMapper.countUserByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }


        return UserReportVO
                .builder()
                .dateList(help(dateList) )
                .totalUserList( help(totalUserList) )
                .newUserList( help(newUserList) )
                .build();
    }


    /**
     * 自己写了一个函数接受list，将其中的元素遍历出来并且之间用","分隔，返回字符串
     * @param list
     * @return
     * @param <T>
     */
    private <T> String help(List<T> list) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            sb.append(list.get(i));
            if (i < list.size() - 1) {
                sb.append(",");
            }
        }
        return(sb.toString());
    }


    //统计指定时间区间内的订单数据
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();

        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //便利dateList集合，查询每天的有效订单数和订单总数
        for(LocalDate date : dateList){
            //查询每天的订单总数 select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数select count(id) from orders where order_time > ? and order_time < ? and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList( help(dateList) )
                .orderCountList( help(orderCountList) )
                .validOrderCountList( help(validOrderCountList) )
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    //根据条件统计订单数量
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }


    //统计指定时间区间内的销量排名前10
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10
                             .stream()
                             .map(GoodsSalesDTO::getName)
                             .collect(Collectors.toList());

        String nameList = help(names);

        List<Integer> numbers = salesTop10
                                .stream()
                                .map(GoodsSalesDTO::getNumber)
                                .collect(Collectors.toList());

        String numberList = help(numbers);

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    @Autowired
    private WorkspaceService workspaceService;

    //导出运营数据报表
    public void exportBusinessData(HttpServletResponse response){
        //1.查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30); //减30天的时间
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        BusinessDataVO businessDatavo = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.通过POI将数据写入到Excel文件中
        //在类路径下读取资源返回输入流对象
        InputStream in = this.getClass()
                             .getClassLoader()
                             .getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet文件
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间，第2行，行标rownum是1
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);

            XSSFRow row = sheet.getRow(3);//获得第4行
            row.getCell(2).setCellValue(businessDatavo.getTurnover()); //第3个单元格
            row.getCell(4).setCellValue(businessDatavo.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDatavo.getNewUsers());

            row = sheet.getRow(4);//获得第5行
            row.getCell(2).setCellValue(businessDatavo.getValidOrderCount());
            row.getCell(4).setCellValue(businessDatavo.getUnitPrice());

            //填充明细数据
            for(int i=0;i<30;i++){
                LocalDate date = dateBegin.plusDays(i);

                //查询某一天的营业数据
                workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),LocalDateTime.of(date,LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString()); //第2个单元格,cellnum是1
                row.getCell(2).setCellValue(businessDatavo.getTurnover());
                row.getCell(3).setCellValue(businessDatavo.getValidOrderCount());
                row.getCell(4).setCellValue(businessDatavo.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDatavo.getUnitPrice());
                row.getCell(6).setCellValue(businessDatavo.getNewUsers());
            }

            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }


}
